I was getting BTF 90% of the time from my G19 Gen4. I sent it back to Glock. They replaced the ejector and the RSA with the newer versions. It's been absolutely perfect ever since, firing over 1,500 rounds of everything including WWB, Sellier & Bellot, cheap TulAmmo, Winchester Ranger NATO, and Speer +P Gold Dots. Get those parts changed and I think it'll eat anything and love it.

My question to Glock would be this: what have you changed in the guns so that now they'll only function as they should on 124gr-up? Obviously there was something about the older guns that has been changed on the new ones. Care to share?

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That is a great question bro. Idk why they would change a thing internally. They worked great the way they were. All my glocks are gen3 and I have not had one problem

115grain 9mm ammo exists so American bullet manufacturers can make 11 bullets for the same amount of metal they would need to make 10 124gr bullets. Cheapskates. Nothing magical about 115s. The gun was designed around 124s.

Glock tweaked the springs and ejectors so the Gen4s I have shot, at least, don't BTF.

Just shot a State Steel Challenge Championship with my G34Gen4. Used Atlanta Arms Blue Box 115s (gun was designed for 124s; didn't say I never shot 115s myself. With the current ammo drought I like everyone else will take what I can get when I can get it.)

Functioned flawlessly and no brass in the face.

Are the ones still causing the problems ones that have not received the updated parts?

Just some comments from a nerd. I did look up the NATO specs the other day. Got tired of not knowing what they really meant. Very old. Glocks were supposed to be designed to meet NATO specs. So they were originally designed for between 108 and 128 gr bullets. Most rounds used would likely have been 124 gr so I assume this is the sweet spot. The pressure ranges stated however appear to be higher than what I see listed for +P loads. So while 115 gr is well within the NATO spec the pressures and energy of less expensive rounds would be lower than NATO. And since any recoil operated pistol is likely dependent on the bullet weight and the internal pressure to cycle the slide, any change from the sweet spot could change the speed of the slide coming back, which affects how the case is ejected from the gun. And of course you can limp wrist it and add another variable to the equation.

I would also assume that a lighter pistol, such as a polymer Glock (and other makes), might also be more prone to limp wrist problems since the polymer frame has less mass to stabalize the gun. But then again it is really nice to have a light pistol for carry.

As for the popularity of Glocks. Seems like they are very popular at this time since a couple of weeks ago a Glock rep told me they had over 600,000 on backorder. Most larger gun stores, including Gander Mt and two Bass Pro Shops I visited recently had no glocks at all.

I have 2 Gen3 G19's. From the start one had BTF problems and the other did not. I have shot everything from 80gr bullets to 147gr bullets and it has made no differences in my pistols ejection patterns.
I call BS!

I have 2 Gen3 G19's. From the start one had BTF problems and the other did not. I have shot everything from 80gr bullets to 147gr bullets and it has made no differences in my pistols ejection patterns.
I call BS!

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That certainly suggests there is some difference between the two guns.

I have 2 Gen3 G19's. From the start one had BTF problems and the other did not. I have shot everything from 80gr bullets to 147gr bullets and it has made no differences in my pistols ejection patterns.
I call BS!

I recently got my G17 gen 4 back from Glock because of a BTF issue. They didn't fix it, and said I need to be shooting 124 grain ammo.

"The gen4 Glocks are made to be a military pistol and are built to handle a higher pressure load. The reason you are getting BTF is because you are shooting Winchester 115 grain." (Of which I have a bulk pack of 1000 of...)

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